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/*
This file is part of TALER
(C) 2014-2020 Taler Systems SA
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file backend/taler-merchant-httpd_private-post-orders-ID-refund.c
* @brief Handle request to increase the refund for an order
* @author Marcello Stanisci
* @author Christian Grothoff
*/
#include "platform.h"
#include <jansson.h>
#include <taler/taler_signatures.h>
#include <taler/taler_json_lib.h>
#include "taler-merchant-httpd_private-post-orders-ID-refund.h"
/**
* How often do we retry the non-trivial refund INSERT database
* transaction?
*/
#define MAX_RETRIES 5
/**
* Make a taler://refund URI
*
* @param connection MHD connection to take host and path from
* @param instance_id merchant's instance ID, must not be NULL
* @param order_id order ID to show a refund for, must not be NULL
* @returns the URI, must be freed with #GNUNET_free
*/
static char *
make_taler_refund_uri (struct MHD_Connection *connection,
const char *instance_id,
const char *order_id)
{
const char *host;
const char *forwarded_host;
const char *uri_path;
const char *uri_instance_id;
const char *query;
char *result;
GNUNET_assert (NULL != instance_id);
GNUNET_assert (NULL != order_id);
host = MHD_lookup_connection_value (connection,
MHD_HEADER_KIND,
MHD_HTTP_HEADER_HOST);
forwarded_host = MHD_lookup_connection_value (connection,
MHD_HEADER_KIND,
"X-Forwarded-Host");
if (NULL != forwarded_host)
host = forwarded_host;
if (NULL == host)
{
/* Should never happen, at least the host header should be defined */
GNUNET_break (0);
return NULL;
}
uri_path = MHD_lookup_connection_value (connection,
MHD_HEADER_KIND,
"X-Forwarded-Prefix");
if (NULL == uri_path)
uri_path = "-";
if (0 == strcmp (instance_id,
"default"))
uri_instance_id = "-";
else
uri_instance_id = instance_id;
if (GNUNET_YES == TALER_mhd_is_https (connection))
query = "";
else
query = "?insecure=1";
GNUNET_assert (0 < GNUNET_asprintf (&result,
"taler://refund/%s/%s/%s/%s%s",
host,
uri_path,
uri_instance_id,
order_id,
query));
return result;
}
/**
* Handle request for increasing the refund associated with
* a contract.
*
* @param rh context of the handler
* @param connection the MHD connection to handle
* @param[in,out] hc context with further information about the request
* @return MHD result code
*/
MHD_RESULT
TMH_private_post_orders_ID_refund (const struct TMH_RequestHandler *rh,
struct MHD_Connection *connection,
struct TMH_HandlerContext *hc)
{
struct TALER_Amount refund;
const char *reason;
struct GNUNET_JSON_Specification spec[] = {
TALER_JSON_spec_amount ("refund", &refund),
GNUNET_JSON_spec_string ("reason", &reason),
GNUNET_JSON_spec_end ()
};
enum TALER_MERCHANTDB_RefundStatus rs;
{
enum GNUNET_GenericReturnValue res;
res = TALER_MHD_parse_json_data (connection,
hc->request_body,
spec);
if (GNUNET_OK != res)
return (GNUNET_NO == res)
? MHD_YES
: MHD_NO;
}
TMH_db->preflight (TMH_db->cls);
for (unsigned int i = 0; i<MAX_RETRIES; i++)
{
if (GNUNET_OK !=
TMH_db->start (TMH_db->cls,
"increase refund"))
{
GNUNET_break (0);
return GNUNET_DB_STATUS_HARD_ERROR;
}
rs = TMH_db->increase_refund (TMH_db->cls,
hc->instance->settings.id,
hc->infix,
&refund,
reason);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"increase refund returned %d\n",
rs);
if (TALER_MERCHANTDB_RS_SUCCESS != rs)
TMH_db->rollback (TMH_db->cls);
if (TALER_MERCHANTDB_RS_SOFT_ERROR == rs)
continue;
if (TALER_MERCHANTDB_RS_SUCCESS == rs)
{
enum GNUNET_DB_QueryStatus qs;
qs = TMH_db->commit (TMH_db->cls);
if (GNUNET_DB_STATUS_HARD_ERROR == qs)
{
GNUNET_break (0);
rs = TALER_MERCHANTDB_RS_HARD_ERROR;
break;
}
if (GNUNET_DB_STATUS_SOFT_ERROR == qs)
continue;
}
break;
} /* retries loop */
switch (rs)
{
case TALER_MERCHANTDB_RS_TOO_HIGH:
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Refusing refund amount %s that is larger than original payment\n",
TALER_amount2s (&refund));
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_CONFLICT,
TALER_EC_REFUND_INCONSISTENT_AMOUNT,
"Amount above payment");
case TALER_MERCHANTDB_RS_HARD_ERROR:
case TALER_MERCHANTDB_RS_SOFT_ERROR:
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_REFUND_MERCHANT_DB_COMMIT_ERROR,
"Internal database error");
case TALER_MERCHANTDB_RS_NO_SUCH_ORDER:
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_NOT_FOUND,
TALER_EC_REFUND_ORDER_ID_UNKNOWN,
"Order unknown (or never paid)");
case TALER_MERCHANTDB_RS_SUCCESS:
break;
}
/* Resume clients that may wait for this refund */
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Awakeing clients on %s waiting for refund of less than %s\n",
hc->infix,
TALER_amount2s (&refund));
TMH_long_poll_resume (hc->infix,
hc->instance,
&refund);
{
MHD_RESULT ret;
char *taler_refund_uri;
taler_refund_uri = make_taler_refund_uri (connection,
hc->instance->settings.id,
hc->infix);
ret = TALER_MHD_reply_json_pack (connection,
MHD_HTTP_OK,
"{s:s}",
"taler_refund_url",
taler_refund_uri);
GNUNET_free (taler_refund_uri);
return ret;
}
}
/* end of taler-merchant-httpd_private-post-orders-ID-refund.c */
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